A set of clear Matlab TFs was taken for the top stage of ETMX (QUAD) earlier (see LHO aLOG entry 13134) and lower stage TFs were also taken over the previous evening, which have now been processed as follows:-

- ETMX L1-L1 undamped (2014-08-01_1090929911_H1SUSETMX_L1_damp_OFF_ALL_TFs.pdf)
- ETMX L2-L2 undamped (2014-08-01_1090938935_H1SUSETMX_L2_damp_OFF_ALL_TFs.pdf)

BSC9 ISI Status: ISI damped and ST1 high isolation.

ETMX alignment: No offset was applied during this measurement.

The above TFs have been compared with equivalent measurements from QUADs at similar phases of testing (allquads_2014-08-01_Phase3a_H1ETMX_L*_Doff_ALL_ZOOMED_TFs.pdf), the plot keys are:-

L1-L1
Blue Trace = Model Prediction.
Orange Trace = H1 ETMY L1 (2014−04−12_1081392124), Phase 3a (in-air).
Magenta Trace = H1 ETMX L1 (2014−08−01_1090929911), Phase 3a (in-air).

L2-L2
Blue Trace = Model Prediction.
Orange Trace = L1 ETMX L2 (2014−03−26_0900), Phase 3b (in-vacuum).
Magenta Trace = L1 ETMY L2 (2014−04−23_0900), Phase 3b (in-vacuum).
Cyan Trace = H1 ETMX L2 (2014−08−01_1090938935), Phase 3a (in-air).

Summary:

L1-L1, ETMX measured peaks reasonably agree with modeled peaks, and are consistent with ETMY, with the largest deviation occurring in the 2nd pitch mode.

L2-L2, no measurements have yet been made for ETMY, so comparisons are made to L1 ETMX & L1 ETMY. Again, peaks generally agreement with the model and are consistent with other QUADs.

n.b. there is still a factor of ~2 discrepancy in the DC scaling of the above results, as was also reported by Arnaud (see LHO aLOG entry 13128). 

All data, scripts and plots have been committed to the sus svn as of this entry.